JPH0335514Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a material clamping device for butt welding thin plates.

[Conventional technology]

Conventionally, there have been devices of this type as shown in FIGS. 4 and 5. In the figure, 1 is a base plate, 2 is a heat absorbing plate embedded in the base plate 1, 3 is a plurality of hydraulic cylinders, 4 is a frame arranged opposite to each other to hold a group of cylinders, and 5 is a base plate 1 and a frame 4 6b is a clamper that also absorbs heat, 7b is a clamper holder that is connected to cylinder 3 and moves up and down, 8 is a welding machine that runs on the top plate of one frame 4, 9 is an electrode,
11 is a thin plate material inserted from the left side of the device, 12
is also a sheet of material inserted from the right side of the device.

Next, the operation will be explained. Material 1 with cylinder 3 activated and clamper 6b raised.
1 and 12 from the left and right sides of the device. The butt lines of the materials 11 and 12 are aligned at the center of the device and clamped with a clamper 6b. Next, an arc is generated from an electrode 9 pulled out from a self-propelled welding machine 8 to continuously weld the abutted portions.

[Problem that the invention attempts to solve]

Since the conventional device is configured as described above, the entire surface of the material is clamped simultaneously by the integrated clamper. Even if there is a large warpage or partial strain in the material, it will be clamped as is, resulting in the problem that deformation other than thermal strain will remain in the product after welding.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a thin plate clamping device that does not cause welding distortion.

[Means for solving problems]

The clamping device according to this invention, when clamping two thin plate materials butted together on a base plate with clampers using a plurality of pressing means along the butting line,
A time difference is provided between the above-mentioned respective clamp operations.

[Effect]

According to the clamping device of this invention, the plurality of clampers clamp the thin plate material at different times.

[Example of idea]

An embodiment of this invention will be described above with reference to the drawings. In Figures 1, 2, and 3, 6 is a plurality of clampers that also serve as heat absorbing plates, and 7 is a cylinder 3.
A plurality of clamper retainers 10 are connected to the clamper retainer 7 and move up and down, and numeral 10 is a clamper locking pin that is fixed to the clamper retainer 7 and slides with the frame 4. Note that the other configurations are the same as the conventional one, so explanations will be omitted.

A plurality of pressing means, for example, a hydraulic cylinder 3, which are arranged opposite to each other, are engaged with a clamper 6 and a clamper holder 7, which are divided into parts along the abutting portions of the thin plate materials 11 and 12, respectively, and actuated (not shown). The means, for example a hydraulic control circuit, is set to operate sequentially from the center of the array to the outside at different times, so that the materials 11 and 12 are warped, for example, like stretching a wrinkled piece of paper with the palm of your hand. It is possible to smoothly clamp from the center to the ends while correcting distortion.

In the above embodiment, a method was shown in which the operating time of the cylinder 3 was shifted using a hydraulic control circuit as the operating means, but the same effect can be achieved by using a mechanism such as a cam, rack, pinion, or the like.

[Effect of idea]

As described above, according to this invention, the clamper is divided into parts, hydraulic cylinders are directly connected to each part, and the time difference is established individually, and the thin plate material is clamped sequentially from the center, so warpage and distortion can be corrected. It is possible to clamp the welded joint plate with a high-quality welded plate product.

[Brief explanation of drawings]

Figure 1 is a front view of a clamping device according to an embodiment of this invention, Figure 2 is a side sectional view of Figure 1, and Figure 3 is a side sectional view of Figure 1.
4 is a front view showing a conventional clamping device, and FIG. 5 is a side sectional view of FIG. 4. 3...Hydraulic cylinder, 6...Clamper, 1
0... Clamper rotation stopper pin, 11, 12...
Thin plate material. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] Two thin plates are butted together on a flat base plate, and clamped between the trapezoid and the above trapezoid by a plurality of pressing means that move the thin plates near the butt up and down along the butted line. In a clamping device having a clamper, a plurality of clampers are disposed corresponding to the plurality of pressing means, respectively, and the plurality of pressing means are actuated sequentially from the center of the arrangement of the pressing means outward at a time difference. A clamping device characterized by being provided with means.